Consolidated Statements of Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues, net	$ 1,813	$ 1,783	$ 1,804
Operating expenses:
Purchased power and fuel	760	829	944
Production and distribution	201	174	178
Administrative and other	218	186	179
Depreciation and amortization	227	238	211
Taxes other than income taxes	98	89	84
Total operating expenses	1,504	1,516	1,596
Income from operations	309	267	208
Other income:
Allowance for equity funds used during construction	5	13	18
Miscellaneous income, net	1	4	3
Other income, net	6	17	21
Interest expense	110	110	104
Income before income taxes	205	174	125
Income taxes	58	53	36
Net income (loss)	147	121	89
Less: net income (loss) attributable to noncontrolling interests	0	(4)	(6)
Net income attributable to Portland General Electric Company	$ 147	$ 125	$ 95
Weighted-average shares outstanding (in thousands):
Basic	75,333	75,275	72,790
Diluted	75,350	75,291	72,852
Earnings per share—basic and diluted	$ 1.95	$ 1.66	$ 1.31
Dividends declared per common share	$ 1.055	$ 1.035	$ 1.01